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Hydrology and dams are two fields that are obviously closely related. Four bulletins have so far been published by the Committee: Selection of Design Flood – Current methods, Dams and Floods – Guidelines and cases histories, Role of Dams in Flood Mitigation – A review and Integrated Flood Management. These bulletins have essentially addressed floods, the risks they represent and their significance for the concerned populations. The present Bulletin deviates slightly from this path, adopting a somewhat more technical perspective. The text consists of three chapters, conceived to be accessible to the practitioners.
Rainfall runoff modeling at a watershed scale requires the definition of the storm event and of the conveying characteristics of the watershed. This research project focuses on the geographic definition of the storm event, that is, on the spatial distribution of precipitation over the watershed. As the watershed size increases, the likelihood that a storm will cover the entire watershed decreases, and it becomes necessary to identify which parts of the watershed are affected by the storm and which are not. Traditionally, precipitation estimates have been based on precipitation records obtained at discrete points (i.e., precipitation stations), which led to depth-duration-frequency (DDF) equations or curves. An estimate of the area covered by the storm event, however, has not been included in the analysis, and it has been customary to assume it uniformly distributed over the entire watershed, regardless of its size. Thus far, no model has been developed to map the area of the watershed that is covered by the storm, as well as to determine the spatial distribution of precipitation over this area. Use of NEXRAD precipitation data, however, will allow the development of a model and geographic-information-systems (GIS) based application that relaxes the assumption of uniformly distributed precipitation and estimates the storm precipitation distribution within the watershed.